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參數資料
| 型號： | DSPIC30F4013-30I/P |
| 廠商： | Microchip Technology |
| 文件頁數： | 69/153頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSPIC MCU/DSP 48K 40DIP |
| 產品培訓模塊： | Serial Communications using dsPIC30F CAN Serial Communications using dsPIC30F I2C Serial Communications using dsPIC30F SPI Serial Communications using dsPIC30F UART dsPIC30F 12 bit ADC - Part 2 dsPIC30F Addressing Modes - Part 1 dsPIC30F Architecture - Part 1 dsPIC30F DSP Engine & ALU dsPIC30F Interrupts dsPIC30F Motor Control PWM dsPIC Timers Asynchronous Stimulus dsPIC30F Addressing Modes - Part 2 dsPIC30F Architecture - Part 2 dsPIC30F 12-bit ADC Part 1 |
| 標準包裝： | 10 |
| 系列： | dsPIC™ 30F |
| 核心處理器： | dsPIC |
| 芯體尺寸： | 16-位 |
| 速度： | 30 MIP |
| 連通性： | CAN，I²C，SPI，UART/USART |
| 外圍設備： | AC'97，欠壓檢測/復位，I²S，POR，PWM，WDT |
| 輸入/輸出數： | 30 |
| 程序存儲器容量： | 48KB（16K x 24） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 1K x 8 |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.5 V ~ 5.5 V |
| 數據轉換器： | A/D 13x12b |
| 振蕩器型： | 內部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 包裝： | 管件 |
| 產品目錄頁面： | 651 (CN2011-ZH PDF) |
| 配用： | AC30F003-ND - MODULE SOCKET DSPIC30F 40DIP DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE ACICE0206-ND - ADAPTER MPLABICE 40P 600 MIL |
| 其它名稱： | DSPIC30F4013-30IP |
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dsPIC30F3014/4013
DS70138G-page 22
2010 Microchip Technology Inc.
The SA and SB bits are modified each time data
passes through the adder/subtracter but can only be
cleared by the user. When set, they indicate that the
accumulator has overflowed its maximum range (bit 31
for 32-bit saturation or bit 39 for 40-bit saturation) and
will be saturated if saturation is enabled. When
saturation is not enabled, SA and SB default to bit 39
overflow and, thus, indicate that a catastrophic over-
flow has occurred. If the COVTE bit in the INTCON1
register is set, SA and SB bits generate an arithmetic
warning trap when saturation is disabled.
The overflow and saturation Status bits can optionally
be viewed in the STATUS register (SR) as the logical
OR of OA and OB (in bit OAB) and the logical OR of SA
and SB (in bit SAB). This allows programmers to check
one bit in the STATUS register to determine if either
accumulator has overflowed, or one bit to determine if
either accumulator has saturated. This would be useful
for complex number arithmetic which typically uses
both the accumulators.
The device supports three saturation and overflow
modes:
1.
Bit 39 Overflow and Saturation:
When bit 39 overflow and saturation occurs, the
saturation logic loads the maximally positive 9.31
(0x7FFFFFFFFF), or maximally negative 9.31
value (0x8000000000) into the target accumula-
tor. The SA or SB bit is set and remains set until
cleared by the user. This is referred to as ‘super
saturation’ and provides protection against erro-
neous data or unexpected algorithm problems
(e.g., gain calculations).
2.
Bit 31 Overflow and Saturation:
When bit 31 overflow and saturation occurs, the
saturation logic then loads the maximally posi-
tive 1.31 value (0x007FFFFFFF), or maximally
negative 1.31 value (0x0080000000) into the
target accumulator. The SA or SB bit is set and
remains set until cleared by the user. When this
Saturation mode is in effect, the guard bits are
not used, so the OA, OB or OAB bits are never
set.
3.
Bit 39 Catastrophic Overflow:
The bit 39 overflow Status bit from the adder is
used to set the SA or SB bit which remain set
until cleared by the user. No saturation operation
is performed and the accumulator is allowed to
overflow (destroying its sign). If the COVTE bit in
the INTCON1 register is set, a catastrophic
overflow can initiate a trap exception.
2.4.2.2
Accumulator ‘Write-Back’
The MAC class of instructions (with the exception of
MPY,
MPY.N,
ED
and EDAC) can optionally write a
rounded version of the high word (bits 31 through 16)
of the accumulator that is not targeted by the instruction
into data space memory. The write is performed across
the X bus into combined X and Y address space. The
following addressing modes are supported:
1.
W13, Register Direct:
The
rounded
contents
of
the
non-target
accumulator
are
written
into
W13
as
a
1.15 fraction.
2.
[W13]+=2, Register Indirect with Post-Increment:
The rounded contents of the non-target accumu-
lator are written into the address pointed to by
W13
as
a
1.15
fraction.
W13
is
then
incremented by 2 (for a word write).
2.4.2.3
Round Logic
The round logic is a combinational block which performs
a conventional (biased) or convergent (unbiased) round
function during an accumulator write (store). The Round
mode is determined by the state of the RND bit in the
CORCON register. It generates a 16-bit, 1.15 data value,
which is passed to the data space write saturation logic.
If rounding is not indicated by the instruction, a truncated
1.15 data value is stored and the least significant word
(lsw) is simply discarded.
Conventional rounding takes bit 15 of the accumulator,
zero-extends it and adds it to the ACCxH word (bits 16
through 31 of the accumulator). If the ACCxL word
(bits 0 through 15 of the accumulator) is between
0x8000 and 0xFFFF (0x8000 included), ACCxH is
incremented. If ACCxL is between 0x0000 and 0x7FFF,
ACCxH is left unchanged. A consequence of this algo-
rithm is that over a succession of random rounding
operations, the value tends to be biased slightly
positive.
Convergent (or unbiased) rounding operates in the
same manner as conventional rounding, except when
ACCxL equals 0x8000. If this is the case, the Least Sig-
nificant bit (LSb) (bit 16 of the accumulator) of ACCxH
is examined. If it is ‘1’, ACCxH is incremented. If it is ‘0’,
ACCxH is not modified. Assuming that bit 16 is
effectively random in nature, this scheme removes any
rounding bias that may accumulate.
The SAC and SAC.R instructions store either a trun-
cated (SAC) or rounded (SAC.R) version of the contents
of the target accumulator to data memory via the X bus
(subject to data saturation, see Section 2.4.2.4 “Data
Space Write Saturation”). Note that for the MAC class
of instructions, the accumulator write-back operation
functions in the same manner, addressing combined
MCU (X and Y) data space though the X bus. For this
class of instructions, the data is always subject to
rounding.
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